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Finding the Fourth Proportional to 318.78, 439.85 and 194.43

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Solution

The fourth proportional to 318.78, 439.85 and 194.43 is: 268.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.78 : 439.85 = 194.43 : x
  2. Step 2: Convert to fraction form
    318.78/439.85 = 194.43/x
  3. Step 3: Cross multiply
    318.78x = 439.85 × 194.43
  4. Step 4: Simplify right side
    318.78x = 85,519.06
  5. Step 5: Solve for x
    x = 85,519.06/318.78
  6. Step 6: Final answer
    x = 268.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.